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This is an automatically generated e-mail. To reply, visit:
<a href="http://git.reviewboard.kde.org/r/107473/">http://git.reviewboard.kde.org/r/107473/</a>
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<pre style="white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I think you started with the wrong assumption that lazy loading of the contents of the playlist file is required.
We have some use cases for PlaylistFile:
1) Make playlists found in the collection folders available through the PlaylistBrowser using PlaylistFileProvider.
2) Restore the session with contents of the playback queue using XSPFPlaylist saved to $KDEHOME/share/apps/amarok/current.xspf.
3) Wherever we need to load or save a playlist file, locally or remote. Like the "Add to playlist..." or "Export playlist..." actions in the menu.
Like you can tell from my inline comments, the support for remote loading needs to be removed from these classes. Fetching the content can be done outside of these classes using load(). The name and other playlist metadata is either in the content (XSPF) or derived from the filename (M3U, PLS). New PlaylistFile derived classes should use whatever the format has available, preferably from the content.
Since you want to add a new Playlist class, what is you use case for it. Is there any need to load remote content in use case 1) or 2) (might be specific about the format)?
I propose you don't refactor PlaylistFile just yet and implement ASXPlaylist so it works as needed for the above use cases. After that we'll have a better understanding for refactoring. I'm sure clean-up and refactor will be needed.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96224#file96224line22" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/LazyPlaylistFile.cpp</a>
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(Diff revision 1)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">using namespace Playlists;</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="n">LazyPlaylistFile</span><span class="o">::</span><span class="n">LazyPlaylistFile</span><span class="p">(</span> <span class="n">KUrl</span> <span class="n">url</span><span class="p">,</span> <span class="n">PlaylistFilePtr</span> <span class="n">playlistFile</span> <span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="o">:</span> <span class="n">PlaylistFile</span><span class="p">()</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">,</span> <span class="n">realPlaylist</span> <span class="p">(</span><span class="n">playlistFile</span><span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">{</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">m_url</span> <span class="o">=</span> <span class="n">url</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">m_tracksLoaded</span> <span class="o">=</span> <span class="kc">false</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">realPlaylist</span><span class="o">-></span><span class="n">setUrl</span><span class="p">(</span> <span class="n">m_url</span> <span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="n">LazyPlaylistFile</span><span class="o">::~</span><span class="n">LazyPlaylistFile</span><span class="p">(){;}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="n">Meta</span><span class="o">::</span><span class="n">TrackList</span> <span class="n">LazyPlaylistFile</span><span class="o">::</span><span class="n">tracks</span><span class="p">()</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">loadRealPlaylist</span><span class="p">();</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">return</span> <span class="n">realPlaylist</span><span class="o">-></span><span class="n">tracks</span><span class="p">();</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "><span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I'm surprised your compiler does not trip up on this. Better remove the ';' to be compatible with the less forgiving compilers out there, like MSVC.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96224#file96224line84" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/LazyPlaylistFile.cpp</a>
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(Diff revision 1)
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">using namespace Playlists;</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="o">!</span> <span class="n">m_tracksLoaded</span> <span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">QByteArray</span> <span class="n">content</span><span class="p">;</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span> <span class="n">getContent</span><span class="p">(</span><span class="n">content</span><span class="p">)</span> <span class="p">)</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">m_tracksLoaded</span> <span class="o">=</span> <span class="n">realPlaylist</span><span class="o">-></span><span class="n">load</span><span class="p">(</span> <span class="n">content</span> <span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">The</span><span class="o">::</span><span class="n">playlistManager</span><span class="p">()</span><span class="o">-></span><span class="n">downloadPlaylist</span><span class="p">(</span> <span class="n">m_url</span><span class="p">,</span> <span class="n">PlaylistFilePtr</span><span class="p">(</span> <span class="n">realPlaylist</span> <span class="p">)</span> <span class="p">);</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="p">}</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">downloadPlaylist just needs to go, it's legacy that I just didn't remove yet. I don't think it's still used. If you do find a use case from it, put the loading outside of the Playlist code and in the user itself.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96225#file96225line61" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/PlaylistFile.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">namespace Playlists</pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/** Loads the playlist from the stream adding the newly found tracks to the current playlist.</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="cm">/** Loads the playlist from the stream adding the newly found tracks to the current playlist.</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This comment has not been valid for a while. loading from a stream just makes tracks available in *this* playlist, doesn't add to the current playlist (a.k.a. the Playback Queue).
Just remove it and write new docs once you know what they need to do.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96225#file96225line66" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/PlaylistFile.h</a>
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<td colspan="4"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">namespace Playlists</pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">virtual</span> <span class="n">bool</span> <span class="n">load</span><span class="p">(</span> <span class="n">QTextStream</span> <span class="o">&</span><span class="n">stream</span> <span class="p">)</span> <span class="p"><span class="hl">{</span></span><span class="hl"> </span><span class="n"><span class="hl">Q_UNUSED</span></span><span class="p"><span class="hl">(</span></span><span class="hl"> </span><span class="n"><span class="hl">stream</span></span><span class="hl"> </span><span class="p"><span class="hl">);</span></span><span class="hl"> </span><span class="k"><span class="hl">return</span></span><span class="hl"> </span><span class="nb"><span class="hl">false</span></span><span class="p"><span class="hl">;</span></span><span class="hl"> </span><span class="p"><span class="hl">}</span></span></pre></td>
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<td bgcolor="#fdfebc" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">virtual</span> <span class="n">bool</span> <span class="n">load</span><span class="p">(</span> <span class="n">QTextStream</span> <span class="o">&</span><span class="n">stream</span> <span class="p">)</span> <span class="o"><span class="hl">=</span></span><span class="hl"> </span><span class="mi"><span class="hl">0</span></span><span class="p"><span class="hl">;</span></span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I don't think we should have load() in the base class. When loading a stream one needs to know what type of playlist is getting loaded, hence need to use one of the specialized PlaylistFile classes (M3U, XSPF, PLS, ...). Polymorphism is not required nor useful here.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96232#file96232line67" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/xspf/XSPFPlaylist.h</a>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">explicit</span> <span class="n">XSPFPlaylist</span><span class="p">(</span> <span class="k">const</span> <span class="n">KUrl</span> <span class="o">&</span><span class="n">url</span><span class="p">,</span> <span class="n">bool</span> <span class="n">autoAppend</span> <span class="o">=</span> <span class="nb">false</span> <span class="p">);</span></pre></td>
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<td bgcolor="#ffffff" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">explicit</span> <span class="n">XSPFPlaylist</span><span class="p">(</span> <span class="k">const</span> <span class="n">KUrl</span> <span class="o">&</span><span class="n">url</span><span class="p">,</span> <span class="n">bool</span> <span class="n">autoAppend</span> <span class="o">=</span> <span class="nb">false</span> <span class="p">);</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This needs to be removed as mentioned earlier. Implement the loading in the user or PlaylistManager (might already be).</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96233#file96233line57" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/xspf/XSPFPlaylist.cpp</a>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="k">if</span> <span class="p">(</span><span class="n">newPlst</span><span class="p">){</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">This is not good. There should be a default constructor that does minimal setup. Move the DOM creation to the save() function instead or create it on demand.</pre>
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<a href="http://git.reviewboard.kde.org/r/107473/diff/1/?file=96233#file96233line218" style="color: black; font-weight: bold; text-decoration: underline;">src/core-impl/playlists/types/file/xspf/XSPFPlaylist.cpp</a>
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<td colspan="2"><pre style="font-size: 8pt; line-height: 140%; margin: 0; ">XSPFPlaylist::loadXSPF( QByteArray &content )</pre></td>
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<td bgcolor="#c5ffc4" width="50%"><pre style="font-size: 8pt; line-height: 140%; margin: 0; "> <span class="n">foreach</span><span class="p">(</span> <span class="k">const</span> <span class="n">XSPFTrack</span> <span class="o">&</span><span class="n">track</span><span class="p">,</span> <span class="n">xspfTracks</span> <span class="p">)</span></pre></td>
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<pre style="margin-left: 2em; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">Here is the real reason why lazy loading is needed. Reading playlist-file contents from disk is too fast to bother, but getting the right Track objects from CollectionManager::trackForUrl() is problematic. It should either block until the track is ready (depends in TrackProviders) or using proxy loading like it is now. The proxy is temporary and gets initialized with metadata we know from the contents of this playlist file.</pre>
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<p>- Bart</p>
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<p>On November 26th, 2012, 12:10 p.m., Tatjana Gornak wrote:</p>
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<div>Review request for Amarok.</div>
<div>By Tatjana Gornak.</div>
<p style="color: grey;"><i>Updated Nov. 26, 2012, 12:10 p.m.</i></p>
<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Description </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">I've started my changes with an implementation of a ASXPlaylist class,
due this work I've found that implementation of different playlist file
types has different logic, as result I end up with a rewriting
playlist's implementations.
As example of difference:
-- Constructor M3UPlaylist::M3UPlaylist( const KUrl &url ) sets a url, but
does not load playlist, therefore loading of playlist are
posponed till data from playlist are actualy needed (lazy loading)
On the other hand constructor XSPFPlaylist::XSPFPlaylist( const
KUrl &url, bool autoAppend ) loads playlist.
The main idea of proposed changes is to create a unify code for
processing playlist files:
-- lazy loading through LazyLoadPlaylist
-- common functionality was moved to PlaylistFile.
It is worth to be noticed that this patch changes structure of
playlist's classes, bit does not changes their behavior, even if this behavior
is inconsistent in some cases.
In following patch-requests I plan to submit ASX Playlist parser and
organize playlists processing in more consistent way.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Testing </h1>
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<pre style="margin: 0; padding: 0; white-space: pre-wrap; white-space: -moz-pre-wrap; white-space: -pre-wrap; white-space: -o-pre-wrap; word-wrap: break-word;">1) All unit-tests were passed.
2) For all playlists I've also checked loading and
saving through gui.</pre>
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<h1 style="color: #575012; font-size: 10pt; margin-top: 1.5em;">Diffs</b> </h1>
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<li>src/CMakeLists.txt <span style="color: grey">(b70147d)</span></li>
<li>src/core-impl/playlists/types/file/LazyPlaylistFile.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>src/core-impl/playlists/types/file/LazyPlaylistFile.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>src/core-impl/playlists/types/file/PlaylistFile.h <span style="color: grey">(4322da9)</span></li>
<li>src/core-impl/playlists/types/file/PlaylistFile.cpp <span style="color: grey">(2730354)</span></li>
<li>src/core-impl/playlists/types/file/PlaylistFileSupport.cpp <span style="color: grey">(2dcc0cd)</span></li>
<li>src/core-impl/playlists/types/file/m3u/M3UPlaylist.h <span style="color: grey">(3176c45)</span></li>
<li>src/core-impl/playlists/types/file/m3u/M3UPlaylist.cpp <span style="color: grey">(2395260)</span></li>
<li>src/core-impl/playlists/types/file/pls/PLSPlaylist.h <span style="color: grey">(e974539)</span></li>
<li>src/core-impl/playlists/types/file/pls/PLSPlaylist.cpp <span style="color: grey">(3ba154a)</span></li>
<li>src/core-impl/playlists/types/file/xspf/XSPFPlaylist.h <span style="color: grey">(ebf3235)</span></li>
<li>src/core-impl/playlists/types/file/xspf/XSPFPlaylist.cpp <span style="color: grey">(bbcecc3)</span></li>
<li>src/core/playlists/Playlist.h <span style="color: grey">(5cf11f2)</span></li>
<li>src/playlistmanager/file/PlaylistFileProvider.cpp <span style="color: grey">(e4e7284)</span></li>
<li>tests/core-impl/playlists/types/file/CMakeLists.txt <span style="color: grey">(ef69236)</span></li>
<li>tests/core-impl/playlists/types/file/TestLazyPlaylistFile.h <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/core-impl/playlists/types/file/TestLazyPlaylistFile.cpp <span style="color: grey">(PRE-CREATION)</span></li>
<li>tests/core-impl/playlists/types/file/m3u/TestM3UPlaylist.cpp <span style="color: grey">(0f19e1b)</span></li>
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<p><a href="http://git.reviewboard.kde.org/r/107473/diff/" style="margin-left: 3em;">View Diff</a></p>
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